Effects of Supplementation of Repeat-Breeder Dairy Cows with CIDR from 5-19 Post-Insemination on Pregnancy Rate


	Pakistan Journal of Biological Sciences
	Year: 2006 \| Volume: 9 \| Issue: 11 \| Page No.: 2173-2176 DOI: 10.3923/pjbs.2006.2173.2176

Effects of Supplementation of Repeat-Breeder Dairy Cows with CIDR from 5-19 Post-Insemination on Pregnancy Rate

N. Shams-Esfanabadi and A. Shirazi

Abstract: Early embryonic mortality, indicated by cows returning to estrus before 24 day after insemination, and late embryonic mortality with cows returning to estrus after 24 days post insemination, contributes to repeat-breeding in dairy cows. The objective of this study was to evaluation the effect of post-insemination supplementation with CIDR (controlled internal drug release) for 14 days on pregnancy rate in repeat-breeders dairy cows. On day 5 after insemination, treated cows (n = 60) received a CIDR, which was removed on Day 19. Control cows (n = 54) did not receive any treatment. The study population was stratified by parity, days in milk and yield of milk production. Pregnancy rate between CIDR treated and control cows were 46.6 and 37%, respectively. There was no significant differences between two groups p<0.05.

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How to cite this article:

N. Shams-Esfanabadi and A. Shirazi , 2006. Effects of Supplementation of Repeat-Breeder Dairy Cows with CIDR from 5-19 Post-Insemination on Pregnancy Rate. Pakistan Journal of Biological Sciences, 9: 2173-2176.

DOI: 10.3923/pjbs.2006.2173.2176

URL: https://scialert.net/abstract/?doi=pjbs.2006.2173.2176

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